You should be aware that many people here have mentioned "dry ice" in the cooler .. which I admit to doing myself. But if they make you open it, and they defenietely might! you may have to pull it out as dry ice is not allowed on planes.

If you can get it flash frozen before you fly you may be ok if they make you pull it out .. then again you may not.

Also good to keep that duct tape handy to reseal anything they make you open during security.